<?php
namespace addons\service\library;

use think\Request;
/*
 * 小程序微信支付
 */
class WxPay {

    protected $userAppid ;
    protected $skillAppid;
    protected $shopAppid;
    protected $mch_id;
    protected $key;
    protected $openid;
    protected $out_trade_no;
    protected $body;
    protected $attach;
    protected $url = 'https://api.mch.weixin.qq.com/pay/unifiedorder';


    public function __construct()
    {
        $payConfig = get_addon_config('epay');
        $serviceConfig = \app\api\model\service\ProjectConfigure::getProjectConfig();
        $this->userAppid = $serviceConfig['userappid'];
        $this->skillAppid = $serviceConfig['skillappid'];
        $this->shopAppid = $serviceConfig['shopappid'];
        $this->mch_id = $payConfig['wechat']['mch_id'];
        $this->key = $payConfig['wechat']['key'];
    }


    public function pay($data) {
        //统一下单接口
        $return = $this->wxApp($data);
        return $return;
    }

    private function wxApp($param) {
        //统一下单接口
        switch ($param['type'])
        {
            case 0:
                $this->appid = $this->userAppid;
                break;
            case 1:
                $this->appid = $this->skillAppid;
                break;
            case 2:
                $this->appid = $this->shopAppid;
                break;
            default :
                $this->appid = $this->userAppid;
        }
        $unifiedorder = $this->unifiedorder($param);

        $parameters = array(
            'appId' => $this->appid,
            'timeStamp' => (string) time(), //时间戳
            'nonceStr' => $this->createNoncestr(), //随机串
            'package' => 'prepay_id=' . $unifiedorder['prepay_id'], //数据包
            'signType' => 'MD5'//签名方式
        );
        //签名
        $parameters['paySign'] = $this->getSign($parameters);
        return $parameters;
    }
    //统一下单接口
    private function unifiedorder($param) {
        $url = $this->url;
        $ip = request()->ip();
        $parameters = array(
            'appid' => $this->appid, //小程序appid
            'mch_id' => $this->mch_id, //商户号
            'nonce_str' => $this->createNoncestr(),
            'body' => $param['body'],
            'out_trade_no'=> $param['out_trade_no'],
            'total_fee' => $param['total_fee'],
            'spbill_create_ip' => $ip,
            'notify_url' => $param['notify_url'], //回调地址
            'openid' => $param['openid'], //用户openid
            'trade_type' => 'JSAPI'
        );
        //统一下单签名
        $parameters['sign'] = $this->getSign($parameters);
        $xmlData = $this->arrayToXml($parameters);
        $return = $this->xmlToArray($this->postXmlCurl($xmlData, $url, 60));

        return $return;
    }


    private static function postXmlCurl($xml, $url, $second = 30)
    {
        $ch = curl_init();
        //设置超时
        curl_setopt($ch, CURLOPT_TIMEOUT, $second);
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE); //严格校验
        //设置header
        curl_setopt($ch, CURLOPT_HEADER, FALSE);
        //要求结果为字符串且输出到屏幕上
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
        //post提交方式
        curl_setopt($ch, CURLOPT_POST, TRUE);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $xml);


        curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 20);
        curl_setopt($ch, CURLOPT_TIMEOUT, 40);
        set_time_limit(0);


        //运行curl
        $data = curl_exec($ch);
        //返回结果
        if ($data) {
            curl_close($ch);
            return $data;
        } else {
            $error = curl_errno($ch);
            curl_close($ch);
            throw new WxPayException("curl出错，错误码:$error");
        }
    }



    //数组转换成xml
    private function arrayToXml($arr) {
        $xml = "<root>";
        foreach ($arr as $key => $val) {
            if (is_array($val)) {
                $xml .= "<" . $key . ">" . arrayToXml($val) . "</" . $key . ">";
            } else {
                $xml .= "<" . $key . ">" . $val . "</" . $key . ">";
            }
        }
        $xml .= "</root>";
        return $xml;
    }


    //xml转换成数组
    public function xmlToArray($xml) {

        if (PHP_VERSION_ID < 80000)
        {
            libxml_disable_entity_loader(true);
        }

        $xmlstring = simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA);


        $val = json_decode(json_encode($xmlstring), true);


        return $val;
    }




    //作用：产生随机字符串，不长于32位
    private function createNoncestr($length = 32) {
        $chars = "abcdefghijklmnopqrstuvwxyz0123456789";
        $str = "";
        for ($i = 0; $i < $length; $i++) {
            $str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
        }
        return $str;
    }


    //作用：生成签名
    public function getSign($Obj) {
        foreach ($Obj as $k => $v) {
            $Parameters[$k] = $v;
        }
        //签名步骤一：按字典序排序参数
        ksort($Parameters);
        $String = $this->formatBizQueryParaMap($Parameters, false);
        //签名步骤二：在string后加入KEY
        $String = $String . "&key=" . $this->key;
        //签名步骤三：MD5加密
        $String = md5($String);
        //签名步骤四：所有字符转为大写
        $result_ = strtoupper($String);
        return $result_;
    }


    ///作用：格式化参数，签名过程需要使用
    protected function formatBizQueryParaMap($paraMap, $urlencode) {
        $buff = "";
        ksort($paraMap);
        foreach ($paraMap as $k => $v) {
            if ($urlencode) {
                $v = urlencode($v);
            }
            $buff .= $k . "=" . $v . "&";
        }
        $reqPar = '';
        if (strlen($buff) > 0) {
            $reqPar = substr($buff, 0, strlen($buff) - 1);
        }
        return $reqPar;
    }


}
